A few months ago our firm migrated from Exchange 2010 to 0365. We have one user whose emails did not automatically update while on cache mode after the initial migration but after a bit of messing around (recreating profile, changing some DNS entry's etc..) it was syncing again. She mentioned this issue started up again yesterday morning although we have not made any changes. The email sends/receive while on non cached mode but outlook tends to operate slow on non cache so its not an option for us.
This is whats been done at the moment:
Ran a repair on 2013 when it was installed
Deleted & recreated a new outlook profile
Deleted existing ost files
Upgraded from 2013 to 2016 to further test if it was software related since we've had some weird issues with 2013
Issue persisted on 2016, deleting everything again and am currently re-downloading the ost while on cache mode. The initial Download of the ost works its after the first download where it does not sync/update emails. Sending works fine however.
The user is using office 2016
Windows 7 64bit
LAN connection on a lenovo thinkpad W540
Windows environment, HP switches & Sophos firewalls.
No other users experience this issue while on cache mode. At most we have search problems on some users which on cache.
Unfortunately this is for a higher up user in the company and I've been on this for a bit and can't figure it out. Thanks for help in advance! This is my first time posting a question here so please let me know if i've left out any additional data you may need.