That's three-quarters as many people as Salesforce has using its software, though there's one big difference: Anyone with a corporate e-mail address can sign up for Yammer, free, and connect with others in the same company.

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The BBC's Jonah Fisher in South Africa says the announcement is a sign of deal under intense stress - but in itself it may not make much difference to the operation of Zimbabwe's government.

BBC: MDC boycotting Zimbabwe cabinet

One such difference was over the UK government's support for the EU - as a whole entity - to sign up to the European Convention on Human Rights.

BBC: EU votes show strong UK dissent - Votewatch study