If you are still running Exchange Server 2003, then you have to quickly track your Office 365 migration, because Exchange 2003 stopped being supported by Microsoft in 2014. Moreover, most Exchange Server 2003 systems run on Windows Server 2003 and this will no longer be Old supported by Microsoft after June 2015.
Both of these events mean that your system will be more open to an external hacker attack because security violations are no longer fixed by Windows updates. You can hire the top Microsoft cloud services consulting team for the success of your business.
In addition, unless you have moved your server to a virtual environment over the past few years, it is very possible that your physical file server also comes out of the warranty, running slowly, approaching the disk capacity, and starting to experience reliability problems. The migration of Exchange 2003 to Office 365 can still be done safely, but there are often extra problems that will be overcome with Microsoft Outlook. Many organizations running Exchange 2003 also run Office 2003.
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The good news is to move to Office 365 presenting a great opportunity to also replace Office 2003 by choosing the Office 365 package which includes Office 365 Plans Premium Business 365. This means that as long as the migration process you have to decide between updating your email system first, and then you can't access it until you have updated all computers to a newer office version (at least Office 2007). Or, you update all computers to a newer office version first and then migrate the Exchange Server to Office 365.
Fortunately, in this case, there is a very good temporary solution – users can use OWA (Outlook Web Access) to access their emails through browsers until their computers are updated to Office 2013. Indeed, it will also be possible for them to now have access to Office 365 Emails on various smartphones and tablets that they may have such as iPhone, iPad, Windows Mobile devices, and Android devices.