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@Grigg_Alister Every forum category has an RSS feed as well which you can subscribe to in Outlook or whichever reader of your choice. New discussions/questions will be included in the feed there, (not comments).

That's the only other option until the messaging/email services are implemented.

The RSS feed url is basically the URL to the category + /feed.rss. So, if you browsed to the Enterprise Content Management > Content Server > OTDS category (https://forums.opentext.com/forums/categories/cs-Directory-Services-OTDS) and wanted to subscribe, you could copy that URL from your address bar, paste it into your reader and add the /feed.rss:
https://forums.opentext.com/forums/categories/cs-Directory-Services-OTDS/feed.rss