I have a strange issue with Outlook 2016 and OST files.
We have recently migrated all users to Office 365 and we have Office 2016 installed on every computer.
I have set Group Policy to turn on cached mode and download 3 months of data as users were complaining it was slow in Online mode. I also have a policy to specify the OST file path: c:\Outlook Data Files.
When a user logs onto a computer and opens Outlook 2016 for the first time it obviously takes a little while whilst it downloads the emails to the OST file.
If the user logs off the computer and back on again and opens Outlook, it then creates another OST file and downloads all the emails again! The new OST file has (1) on the end.
A new OST file gets created every time, ending in (2) .... (3) etc
I can’t seem to work out why Outlook isn’t remembering that it already had an OST file on the computer.
I assume this information would be kept in AppData which we don’t currently redirect due to lack of disk space so gets stored in their profile in C:\users The profiles do not get deleted on log off.
If someone could point me in the right direction I would be very grateful.
