Hi David,
Did this issue occur to all Lync clients?
Lync 2013 client should not ask for Microsoft account and password when it starts, because Lync 2013 client use Windows authentication, what happen if you click “Cancel” when Lync 2013 start?
To this issue, please rebuild Lync profile to check if the issue persist. you could install Office on a fresh OS and start Lync 2013 to have a test.
Best Regards,
Jim Xu
TechNet Community Support
Please remember to
mark the replies as answers if they helped.
If you have feedback for TechNet Subscriber Support, contact
tnmff@microsoft.com.