Out of office reply. I'm on leave until Thursday.

[Reatreat]

Does that mean they'll be in on Thursday or will they be on leave on Thurs!

It means back in on Thursday...

I would assume they will be in on Thursday

Thank you! It's less confusing if they'd put. I'm on leave and will return in Thursday!

At least they did something.

I always put the date I'm back so to clarify for anybody who emails
Anyway, I'd assume they are back on Thursday.

Take the statement to its full conclusion.

i will be out of office until Thursday, when I will return to work.

They'll be back in on thursday

I'd still get emails on Tuesday saying 'I need this tomorrow morning' and 'Is it ready, send it over now' and 'Why haven't you done it yet?' on Wednesday.