This from our corporate "daily briefing":

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Do your bit to stop apostrophe abuse!

Can you tell your 'it's' from your 'its' ? Are you secretly unsure about how to use apostrophes? Think you are getting your itses right, but are silently driving punctuation-loving colleagues to despair?

If you can't see anything wrong with 'please replace the trolley's', 'your 21 today' , 'in a weeks time', or customer's toilets', read this guide now and avoid embarrassing errors in your communications with staff, partners and external customers.

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Obviously I should be happy that my employer takes this stuff seriously, but my god, does the necessity for a guide to basic grammar on our intranet depress me.

More to the point, is itses really a word? And if not, what else would you use for the plural form? I can tell that this is going to bug me for the rest of my life.