There is still a threat of a postal strike in Windsor Essex.

A strike mandate for more than 51,000 members of the Canadian Union of Postal Workers expires on Thursday.

That means at any point up until just before midnight, the union can serve Canada Post with 72-hours strike notice.

CUPW Local 630 spokesperson Phil Lyons says if they do not go out on strike, they have to vote again.

That vote could take two months to complete, which puts the two sides at the start of the Christmas mailing season.

Lyons says that would be the worst time to strike.

The Crown corporation also has the option to lockout workers after Thursday.

Spokesperson Jon Hamilton tells CTV News they would like to avoid a strike or lockout.

The good news is talks have never broken down between Canada Post and CUP-W.

The union claims there are two main stumbling blocks – pay equity and a proposed move from a defined benefit pension plan to a defined contribution plan.

Lyons claims rural postal workers make, on average, about 28-percent less than carriers in the City.

An arbitrated settlement was imposed on five-thousand members of the Canadian Post Masters Association. That is separate from CUPW.

That settlement is for employees at rural Canada Post offices.