Choosing providers for collaboration tools (email, support, etc)

Workspaces (email, video conferencing, etc)

For sending non-automated emails, you have a few options. The "traditional" providers - Microsoft and Google - are actually fairly expensive, and unless you plan to make use of all the features they offer, that can be an unnecessary expense if you're starting out.

Consider cheaper alternatives; the email service market is a very competitive one, and plenty of companies offer decent email services for far less money than the big players.

Support Provider (optional)

Depending on your use case, you might want a support provider - software that gives you the ability to have support tickets and the like in one place, and make it easier to deal with support queries when you have more than one person on a team.

It is of course possible to implement this yourself, which can come with the benefit of more consistent styling and presentation and some more customisation ability, but it's not likely to be worth the hassle in most cases.

Crisp, Zendesk and Zoho Desk Express are some examples of providers here (Crisp is rather expensive).