If your maintenance period end this June, then you should be able to upgrade to JIRA 6 after that. Because JIRA 6 was release this month, hence your maintenance period cover it, however any JIRA release after June is not available for you until you renew your maintenance period.
Hope the above information clarify your doubts on this issue.
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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