Testing with outlook.com has shown that it is possible to have two folders with
the same name, if they have different types (for example, on outlook.com, the
user's calendar and tasks folders have the same name but different collection
IDs and different types).

The folder name support in activesync should be enhanced to remember, and
check, the folder type when matching the name.

Until this is fixed, the problem can be worked around by using the collection
ID instead of the name.  Unfortunately, the user cannot necessarily find out
that the problem is happening (because --print-databases can only show the
folders for which there are backends handling them -- there is currently no
tasks backend, for example).