There were issues in migrating your account from Microsoft Office Communications Server 2007 R2 to Microsoft Lync Server 2010 communications software. When your account is moved to a Lync Server 2010 pool, your data is moved to the back-end database that is associated with the new pool.
Lync Server 2010 requires that you upgrade to the latest client software, otherwise your computer may experience unpredictable behavior.
Contact your system administrator to resolve issues related to your account. It may be that your account is not appropriately configured on the server.