Nothing has sunk. No engine has stopped and no cargo has gone astray. Yet as Microsoft 365 disruption continues, shore offices are confronting a different kind of operational vulnerability: losing access to the communications that keep fleets moving.

Shipping has put much of its office work into one cloud for good reasons. But a single fault far from any port can now disrupt the desk that talks to the bridge.

The question for shipowners is simple: if your inbox goes quiet today, how long can your operations continue as normal?

Ask a ship manager to name their critical systems and the list will start on board: engines, navigation, cargo control and perhaps the satellite link. Email rarely makes the cut. Friday’s Microsoft 365 outage is showing why it should.

Exchange Online has been experiencing significant disruption, and Microsoft has listed 20 services as affected. Users are reporting problems accessing mailboxes and calendars, alongside delays in email delivery. In shipping, that inbox carries fixtures, voyage orders, bunker nominations, agency instructions and crew change plans. Ships may continue sailing, but the decisions supporting their operations risk slowing down, and nobody had to declare an incident for that to happen.

The industry’s real exposure is concentration. In recent years many owners and managers have moved mail, documents, collaboration, device management, data protection and AI assistants onto a single Microsoft tenant. The logic was sound. One supplier means lower cost, simpler administration and stronger security controls. The trade-off is that one routing fault can take out communication and protection together.

That is what happened here. Safe Links and Safe Attachments, the filters that catch fake invoices and spoofed supplier emails, have also been reported as affected while staff were working around a broken inbox. Payment fraud thrives on that kind of confusion. Any account change received during the outage deserves a phone call before money moves.

The outage was not a one-off either. Microsoft 365 suffered a global disruption in April and a North American one in July. Three events in a year is enough to treat cloud downtime as a normal operating condition, the way owners already treat weather delays or port congestion.

The fixes are modest. Owners need a backup mail route for vessel and agency traffic, an offline contact list for masters, agents and charterers, and agreed rules for confirming fixtures and payments when email is down. They should also know whether ship and shore share the same tenant.

IMO already expects cyber risk to be covered in the safety management system. Owners who rehearse a dead inbox the way they rehearse a fire drill will lose far less the next time the cloud goes quiet.

Loss Prevention: When Compliance Is Not Enough

Completed inspections, documented procedures and corrective actions are important parts of managing maritime risk. But how can operators tell whether they are actually preventing incidents?

On Tuesday 17 November at 11:00 AM GMT, RightShip’s Christopher Saunders and OneOcean’s John Hissey will examine this question using real case studies.

The second webinar in OneOcean’s See Further series will explore how better information, human judgement and lessons from previous incidents can help operators identify risks earlier and make practical improvements beyond minimum compliance.

» Register now and put your questions to the panel «

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What Does Effective Loss Prevention Look Like in Practice? A live webinar in partnership with OneOcean | 17th November 2026
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Seatrade Maritime’s Marcus Hand joins Nick Chubb and Raal Harris to unpack Crew Connect 2026 in Manila: a crewing agenda reshaped by geopolitical risk, emerging technology and persistent workforce pressures. They explore what the industry’s more candid debates reveal about seafarer safety, training, fatigue and the future of maritime careers.

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