We recently migrated our SBS 2008 DC to a 2012 R2 DC, and pushed the mail to O365.
Since the SBS was decommissioned/demoted yesterday, we are experiencing the following issues:
- Slow opening applications (word, excel etc)
- Slow opening or saving files
- Slow opening attachments in Outlook
- Slow discovering local and mapped drives in Windows explorer
The new DC resumed the DNS, DHCP roles.
Interestingly, when I disable my NIC and try to open local files, programs, Outlook attachments, windows explorer etc, all returns to the usual snappy speed.
All the clients are Windows 7 x64
Please advise where I should start looking.
Thanks in advance all!