Thunderbird update

Hi,

Thunderbird updated today. Now when I try to email a word document as an attachment I get an error

"Logon failed, you must log onto Microsoft exchange to access your address book. Error code: Unspecified error"

What does that mean exaclty? I have thunderbird set as my default mail client.

Any ideas anyone at all pls?

TIA
Helan

A reboot sorted it now