The reason is likely that Communicator defaults to high security mode for address book download.What the error means is that there is a Communicator policy entry for Abs Inside URL that specifies the address of the Global Address Book server to use when signing in, and it is not a secure URL that matches the https scheme.
For example, assume that you need to discuss a proposal with a co-worker.
You look at her status in your Contact List and see that the contact is available.
In the option of Communicator, the option “Update my presence based on my Calendar information” is checked but that doesn’t seem to work either. The bad new is; Communicator 2007 R2 isn’t compatible with Office 2013.
The good news is; You can still make Lync 2013 work with Communications Server 2007 R2. To make Lync 2013 connect to Communications Server, add the following Registry key: Key: Officially, this isn’t a supported configuration for Lync (connecting to Communications Server 2007 R2) but it works nonetheless.
You sign in for the first time and you see a red exclamation point on the Office Communicator icon in the notification area as shown in Figure 1. Red exclamation point To get more information about this warning, open Communicator and click the View Missed Notifications folder.