Outlook performance issues after windows 11 upgrade?
Posted by AThievingMagpi@reddit | sysadmin | View on Reddit | 7 comments
Hey Guys,
Have anyone else noticed that Classic Outlook has gotten worse performance wise since the windows 11 upgrade?
Ever since we rolled it out, users have complained about it being really slow when moving to different mailboxes or even forwarding emails to folders in mailboxes. It will also crash at times while doing this too.
Seems like moving to the New Outlook improves the performance drastically, but the annoying thing with New Outlook is that you can’t drag and drop attachments, it only works when you drop them to your desktop or documents but if you need to drop them into a website (in this case Infor LN) it doesn’t play ball.
TheGilmore@reddit
Disable cache or reduce it to something like 6months-1 year. Outlook gets slow when the ost gets larger than 15gb or so. Also make sure “download shared folders” is off if you stick with cached mode.
Tidder802b@reddit
Have you deleted the OST file?
AThievingMagpi@reddit (OP)
Nope haven’t deleted the OST file, but moving to the new outlook is a workaround for some users i have came across so far.
WontedTangent@reddit
I have noticed that Shared Mailboxes being setup as additional are performing worse recently. I have added ant mailbox I have full access to, under accounts. This has made a huge difference to performance.
Helpjuice@reddit
Upgrade the machines the users are running on and start out with a test sample. Take your users performance metrics that are complaining of issues and move them up to 32GBs of RAM, better cpu, and better NVMe SSD and see if the problem still exists.
vermyx@reddit
Having done plenty of win11 upgrades, this has nothing to do with the win11 upgrade itself. You either are running windows with 16GB or less, or your users have a lot of folders. New outlook is essentially an app wrapper around the browser, so it is like running classic outlook with a direct connection instead of local cache. Switch your problem users on classic outlook to not use cache and it will probably behave better
AThievingMagpi@reddit (OP)
Yeah most of the users having this issue are on 16GB machines and use shared mailboxes with ALOT of folders. One department treats their shared mailbox like a file repository, so that could probably be a factor as well. Thanks for your reply 👍