Unable to complete the operation BadRequest : The password for user has expired

When you launch an application (PowerPoint for example) if you get the following message:

Unable to complete the operation.
BadRequest : The password for user ' ' has expired. Please contact the Enterprise Connect Administrator for instructions on changing the password.

...it is from OpenText Enterprise Connect. This is the MS Office integration software for the OpenText document management system (which presumably your organisation/company uses).

The solution is to change/reset your OpenText document management password.