Forum Discussion
The default mailbox size for Exchange Online E3 and E5 users is increasing from 50GB to 100GB
BillR Well, I'm not sure about the books... but in any case, I enjoy writing, which is why I do https://office365itpros.com/ now.
In any case, when we talk about cached mode, it's important to realize that this is a combination of:
- Foreground threads (for delivery of new email)
- Background threads (for "drizzle mode" synchronization of mailbox folders)
- OST (storage)
Network hiccups can slow the first two; a slow disk will slow the OST. The more data is in the OST, the harder it must work, and the harder it works, the more influence disk speed has on its performance. This is why I observe the 5 GB on SSD rule.
Good that you mentioned the foreground vs. background... I guess I forgot to mention that when we have users with large mailboxes/OSTs on high latency networks or heavy travelers (satellite or cell when traveling), we turn off Outlook Hybrid mode for them, because it totally hangs Outlook in cached mode.
Add this key and set value to 1 to disable hybrid and run totally cached mode/sync:
HKCU\software\policies\microsoft\office\16.0\outlook\
DWORD - hybrid!localcaching
Cheers,
Bill
BillR Twenty-year old clients do tend to carry some baggage with them...
Still seems to work with Outlook 2016 and 2019. "Deprecated" vs. discontinued, so maybe it partially works (?) (like my powershell commands that I'm supposedly not supposed to use anymore that still work great, but give me a bunch of annoying yellow-text warning messages). I haven't tried it with the 365 Click to Run yet. ...There's always some "purple smoke", as my team likes to call it, going on behind the scenes with Outlook!
BillR the interesting thing is that https://docs.microsoft.com/en-us/exchange/outlook/cached-exchange-mode says that Fast Exchange Access (which this feature was called) is deprecated in Outlook 2016. However, the registry setting still exists for that version and obviously still works for you. I wonder what's going on?
BillR That brought back some memories: https://www.itprotoday.com/email-and-calendaring/outlook-2013-introduces-hybrid-cached-mode