Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
1 answer
One of the answers was accepted by the question author.
Problems with accessing the updated copilot
I have a number of email address for home and business. My original Copilot was set up using a home email address but when I have tried to install the new copilot it has used a business email I want my copilot on my home address how do I do it? I have…
Microsoft Copilot | Windows Copilot | Copilot+ PC
asked
2026-11-04T11:29:17.5266667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(217.60000000000002, 85%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDM%3C/text%3E%3C/svg%3E)
David Mills
20
Reputation points
accepted
2026-11-05T13:49:24.7766667+00:00
David Mills
20
Reputation points
2 answers
Why does the Copilot key now open a small text bar as opposed to the whole app and how do I fix the issue?
Since getting my Copilot PC I have enjoyed using the key to open Copilot, however I don't understand what has changed and whether it is intentional or not. How do I change it back?
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
asked
2026-10-30T01:26:50.52+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(240, 82%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EEJ%3C/text%3E%3C/svg%3E)
Ethan Jones
0
Reputation points
commented
2026-11-05T12:58:58.5766667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(22.400000000000002, 26%, 12%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EVT%3C/text%3E%3C/svg%3E)
Vikki-T
13,230
Reputation points Microsoft External Staff
Moderator
1 answer
Oct 2026 Migration: I Chats Missing from Standalone Copilot / Valuable Research Unavailable or Lost
With the Oct 2026 none of my chats from the standalone tool are displayed. Only Microsoft 356 Copilot chats are visible. Not having access to important research is causing great impact and anxiety. I think this is a profile issue in that in the…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
asked
2026-10-28T00:17:20.5166667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(176, 10%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EKP%3C/text%3E%3C/svg%3E)
Kate Peterson
0
Reputation points
commented
2026-11-05T12:54:05.2+00:00
Vikki-T
13,230
Reputation points Microsoft External Staff
Moderator
2 answers
Why does copilot waste image credits and return nothing?
Frequently when using copilot for image generation, it will either stall out and just not respond, or claim that it has generated an image when it hasn't. I went back yesterday to check the credits, and it turns out that some of these failures are…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(112.00000000000001, 98%, 20%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EP%3C/text%3E%3C/svg%3E)
1 answer
Unable to install Microsoft Copilot on my Windows laptop
When I try to install the application, I receive an error message (or the installation fails without any message). I have already checked for Windows updates and restarted my computer, but the issue remains. Has anyone experienced a similar problem or…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
asked
2026-11-02T22:09:28.9933333+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(294.40000000000003, 36%, 38%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAW%3C/text%3E%3C/svg%3E)
Angelika Wikaryjak
5
Reputation points
commented
2026-11-04T11:11:42.1166667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(249.60000000000002, 12%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ECN%3C/text%3E%3C/svg%3E)
Clary-N
18,695
Reputation points Microsoft External Staff
Moderator
2 answers
Not all chats migrated
The chat title still appears in my history after migration to the new Microsoft 365 Copilot experience on my android. All other chats migrated successfully. Only one long-running chat ("Personalized Fasting Journal") shows pop up "We…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(89.60000000000001, 67%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EM%3C/text%3E%3C/svg%3E)
2 answers
I got redirected from the old Copilot to a new one how to I bypass this it happened on September 1st 2026
let me know what you guys can do it better a"100% MUST work around"kay thanks bye
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
asked
2026-09-16T01:26:03.61+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(137.6, 7.000000000000001%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ELJ%3C/text%3E%3C/svg%3E)
Lila Jane Ferry(Kyubey)
15
Reputation points
edited a comment
2026-10-31T04:44:29.6366667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(307.2, 4%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJJ%3C/text%3E%3C/svg%3E)
Jebbooo Jebbooo
415
Reputation points
1 answer
Copilot chats visible in Legacy app but missing on web. Human review needed.
My chat history is still visible in Copilot Legacy on mobile but is missing from the web experience under the same Microsoft account. This appears to be an account migration or synchronisation problem involving existing data.
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(240, 93%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3END%3C/text%3E%3C/svg%3E)
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(281.6, 82%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EEN%3C/text%3E%3C/svg%3E)
2 answers
Copilot - Pinned chats no longer pinned and when I try to open them from the chat list on navigation - they won't load
All pinned chats disappeared from my personal Microsoft account around October 26, 2026. The issue occurs in both the Copilot app and the web version. The pinned conversations initially appeared in history but would not open. They are now no longer…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
asked
2026-10-28T16:43:10.4+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(51.2, 92%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ECN%3C/text%3E%3C/svg%3E)
Cari Nicholas
0
Reputation points
commented
2026-10-30T12:15:49.6+00:00
Vikki-T
13,230
Reputation points Microsoft External Staff
Moderator
1 answer
One of the answers was accepted by the question author.
Getting a limit reached message in Copilot for references in a Notebook
I think yesterday was the first time I've added more than 20 references to an Notebook. I added 24 links. But now I have a message stating "Limit reached: Copilot can chat about the 20 oldest items in your notebook." I have a Microsoft 365…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(275.2, 14.000000000000002%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ELG%3C/text%3E%3C/svg%3E)
1 answer
HOW DO I GET MY OLD COPILOT BACK
I want my old Copilot back ... Please fix this... Tell us how to get the old one back... I am not doing this new one
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
asked
2026-10-21T14:18:55.92+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(268.8, 20%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJJ%3C/text%3E%3C/svg%3E)
Judy Johnson
35
Reputation points
commented
2026-10-27T23:48:35.01+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(230.39999999999998, 49%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EIT%3C/text%3E%3C/svg%3E)
Ian-T
15,605
Reputation points Microsoft External Staff
Moderator
1 answer
Cant login with Gmail in copilot desktop app
So i have 1 Hotmail and 2 Gmail accounts, the Gmail I'm trying to use which has all my chat history isn't on there for a quick login. I've been using copilot (legacy) on my phone/web browser for a long time now, i still have everything on my phone but…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(73.60000000000001, 11%, 17%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EG%3C/text%3E%3C/svg%3E)
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(300.8, 72%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ECL%3C/text%3E%3C/svg%3E)
1 answer
Copilot Notebook Missing After Copilot 365 Migration
My notebook "Training Plan for Intercom Project" was fully accessible on 22/10/2026. On 23/10/2026 I was informed that Copilot 365 was being migrated to Copilot. After the migration, the notebook title remained visible but its contents became…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(6.4, 15%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EW%3C/text%3E%3C/svg%3E)
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 39%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EKH%3C/text%3E%3C/svg%3E)
2 answers
My Copilot chat history has disappeared.
Hi. Although available last night, my Copilot chat history has now disappeared. I use the desktop app and have not logged out of my account. I did receive a synching message this morning, but nothing has returned. I did also receive a message in the…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
asked
2026-10-22T18:32:36.73+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(259.20000000000005, 82%, 35%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAC%3C/text%3E%3C/svg%3E)
Andy Coffey
0
Reputation points
edited a comment
2026-10-24T12:10:07.92+00:00
Vikki-T
13,230
Reputation points Microsoft External Staff
Moderator
2 answers
One of the answers was accepted by the question author.
Poof! Where are my Copilot Chats??
Poof...just like that my Copilot chats are gone! No forewarning, no chance to transfer important chats off Copilot, just nothing. Copilot isn't even up to date on the "migration". It says my chats should be restored after the migration is…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(9.6, 88%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ES%3C/text%3E%3C/svg%3E)
1 answer
After the last update, co-pilot does not work.
Co-pilot worked fantastically up until this past week. I never had a problem with it. Now, since the latest update, it does not work at all. My work in my projects folder is gone. It keeps crashing or not loading. It went from being a useful tool to less…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
asked
2026-10-20T15:55:09.3466667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(166.4, 16%, 26%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDM%3C/text%3E%3C/svg%3E)
Deborah Morey
0
Reputation points
edited an answer
2026-10-21T05:11:14.6233333+00:00
Clary-N
18,695
Reputation points Microsoft External Staff
Moderator
2 answers
How to remove "ai components" from my computer
I had to buy a new computer recently and unfortunately everything seemed pretty much steeped in ai. Unfortunately I ended up with a copilot+ computer, because it seemed like pretty much EVERYTHING had it. I have gone through my settings and disabled and…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
asked
2026-08-06T01:23:41.6466667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(240, 93%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMO%3C/text%3E%3C/svg%3E)
Maeve O'Shea
0
Reputation points
edited a comment
2026-10-20T18:02:34.3633333+00:00
laughey
51
Reputation points
1 answer
Copilot forgetting topics and memories after recent update
Microsoft Copilot did an update last week and now it doesn't remember the two projects we had been working on for about a year. It also takes a long time for the page to load now and it crashes frequently, like a couple minutes after being on the page. I…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(224.00000000000003, 84%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ES%3C/text%3E%3C/svg%3E)
1 answer
Copilot update locked me out of my personal account chats
I am a full-time student. One of my classes requires me to feed specific prompts to AI to analyze the answers it gives. I chose Copilot. Upon initial registration, I signed in with my school email through the Google account option and listed the chats as…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(6.4, 16%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAS%3C/text%3E%3C/svg%3E)
2 answers
My recent chat history disappear though I did not delete them
Microsoft Copilot chat history disappeared. I created a folder containing multiple Copilot conversations and several chats were pinned. I did not delete them. The entire folder has disappeared, and the pinned conversations are no longer visible. I am…
Microsoft Copilot | Windows Copilot | Copilot+ PC
Microsoft Copilot | Windows Copilot | Copilot+ PC
A PC equipped with advanced AI capabilities and Windows Copilot integration
282 questions
asked
2026-10-12T22:05:23.4066667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(124.80000000000001, 99%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ETK%3C/text%3E%3C/svg%3E)
Thi Kim Thao Phan
0
Reputation points
commented
2026-10-14T10:11:30.06+00:00
Vikki-T
13,230
Reputation points Microsoft External Staff
Moderator