Hi community,
I have a big problem with Outlook and Office 365.
In one location with a very good internet connection (100Mbit up, 40Mbit down) sending mails with Outlook 2010/2013/2016 is very slow. The upload Speed to the datacenter is only about 80KBit/sec. When sending mails with OWA or uploading files to Onedrive the speed is fine.
We tried the Microsoft Speed Analyzer for Office 365 customers. The result was 100Mbit down, 34Mbit upload --> Everything seems fine.
What can be the reason for this slow upload?
The ISP is Deutsche Telekom and we are using a Hybrid-Technology with DSL and LTE.
It seems, that the Outlook upload is not using the fast LTE-path. But why? The other uploads are in best quality?
Can anyone help us?
The enviroment in short:
- OS: Windows 10 Prof (Latest update)
- Office 2016 from Business Premium Plan
- local firewalls off
- same speed when Antivirus Software on or off
- no Proxy
- no Lync-Integration
- same result with or without cache-mode
Thanks for your help!
Best regards
André