Office Add-In: Empty group label

Problem

I needed to create Outlook Add-In Ribbon button without Group label, like the Insights Add-In does.

Solution

As the Group element requires Label, and the String of the Label requires DefaultValue to have some value, the workaround was to set the DefaultValue as one space character.

Ta-daa!

MOSS: Connect to Outlook missing from my custom tasks list

Problem:
I created a custom tasks list, now "Connect to Outlook" option is missing in Actions menu, Client Integration is enabled.

Workaround:
Your custom task list must have same type as the original MOSS list, i.e., your custom Task list must be of type 107. This doesn't seem to be a requirement with DocLibs, however.