If you deploy a Windows Virtual Desktop (WVD) Windows 10 with O365 session host, and configure FSlogix for the profiles management (as you should!) The cache size for outlook is hard coded to 1 month and cannot be changed:
This is great from a disk usage perspective, but in my case i needed to increase this to at least 3 months to allow the Egress prevent add in to work correctly.
To do this we need to fire up regedit and head to:
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Outlook\cached mode
And there we find this:
We can change the syncwindowsetting to anything up to 6, and it will change the number of months cached accordingly:
Anything above 6 will result in all mail being cached:
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